Home Back to the Challenge Answer Try These Think About This... ResourcesTry Another Challenge  
Figure This!

Scott Kim calls anything that can be read in more than one way an "inversion."

He used such writing in developing new font systems for computers.

Graphic artist John Langdon of Philadelphia, has developed writing similar to Kim's that he calls "ambigrams."

Artist M. C. Escher used many types of symmetries in designing his famous tessellations.

A circle and a sphere have the most symmetries of any geometric objects.

A figure with both horizontal and vertical lines of symmetry also has 180° rotational symmetry, but not the other way around.

Home · Back to the Challenge · Answer · Try These · Think About This · Resources
Try Another Challenge · Challenge Index · Math Index · Printing the Challenges · En Español
Family Corner · Teacher Corner · About Figure This! · Purchase the CD
©2004 National Council of Teachers of Mathematics
Web site and CD-ROM design/production
© 1999-2004 KnowNet Construction, Inc.